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JANUS®2.4 GHz Radio FrequencyP/N 064819-001Quick Reference GuideIntermec Corporation6001 36th Avenue WestP.O. Box 4280Everett, WA 98203-9280U.S. service and technical support: 1-800-755-5505U.S. media supplies ordering information: 1-800-227-9947Canadian service and technical support: 1-800-688-7043Canadian media supplies ordering information: 1-800-268-6936Outside U.S. and Canada: Contact your local Intermec service supplier.The information contained herein is proprietary and is provided solely for the purpose of allowing customersto operate and/or service Intermec manufactured equipment and is not to be released, reproduced, or usedfor any other purpose without written permission of Intermec.Information and specifications in this manual are subject to change without notice. 1996 by Intermec CorporationAll Rights ReservedThe word Intermec, the Intermec logo, JANUS, IRL, TRAKKER, Antares, Duratherm, PrecisionPrint, PrintSet, Virtual Wedge, and CrossBar are either trademarks or registered trademarks ofIntermec Corporation.Throughout this manual, trademarked names may be used. Rather than put a trademark ()symbol in every occurrence of a trademarked name, we state that we are using the names only in aneditorial fashion, and to the benefit of the trademark owner, with no intention of infringement.JANUS 2.4 GHz Radio Frequency Quick Reference GuideiiiContentsOverview of an Intermec 2.4 GHz RF Network 5Setting Up the JANUS RF Devices 5Attaching the Antenna 6Using the JANUS 2.4 GHz Installation Utility 7Using the JANUS RF Devices 8Using the J2020 User’s Manual With Your JR2020G or JG2020 8Using the J2050 User’s Manual With Your J2050A or JG2050 8Logging Into or Out Of Novell Software 8Using the JANUS Programmer’s Software Kit (PSK) 9Developing Applications 9About the JANUS Configuration Files 10Using RF Communications 10Understanding the RF Status Icons and LEDs 11Managing Your JR2020G and JG2020 Battery Power 12Troubleshooting Your JR2020G and JG2020 13Troubleshooting Your J2050A and JG2050 14JANUS 2.4 GHz Radio Frequency Quick Reference Guide5The JG2020 and the JG2050 for the 2.4 GHz network is slightly different than the onedescribed in the standard JANUS 2020 User’s Manual. Even though many of thefeatures and configuration commands are the same, your device does not supportIRL or PSK Transmit and Receive functions.Overview of an Intermec 2.4 GHz RF NetworkA radio frequency (RF) data collection network establishes a two-way radiolink between a JANUS RF device and a host. The data from the device is sentin real time through the RF system to an 0100 Access Point and then on to thehost. The RF link is completely transparent to the user. The followingillustration shows one example of an Intermec 2.4 GHz RF data collectionnetwork.A Typical Intermec 2.4 GHz NetworkEthernet0100J2050JANUSQ.001HostJG2020With your JANUS RF device you can move anywhere within the range of anaccess point and transmit data to and from the host.Setting Up the JANUS RF DevicesThe JR2020G and the JG2020 are JANUS 2020 hand-held data collectioncomputers that operate in Intermec’s 2.4 GHz RF network. The J2050A and theJG2050 are vehicle-mount computers that also operate in this network.Before you can operate any JANUS RF device in the 2.4 GHz RF network, youneed to:• Attach the antenna to the JR2020G, JG2020, J2050A or JG2050.JANUS 2.4 GHz Radio Frequency Quick Reference Guide6• Use the JANUS 2.4 GHz Installation Utility to install the network softwareand set the network and radio parameters on your JANUS device.Attaching the AntennaCautionThe antenna must be attached before turning on the JANUS RFdevice. The internal radio could be damaged if the antenna is notattached.ConseilSi l’antenna n’est pas attachée avant que l’appareil RF de JANUSsoit mise sous tension, la radio interne peut être endommagée.Note: Do not interchange antennas between any of the JANUS RF devices. Eachantenna is built specifically for the radio that is installed in the device.1.Make sure the JANUS RF device is switched off. If the device is on, switchit off by pressing.2.Screw the antenna into the connector of the device. Refer to the followingillustrations.3.Switch on the device by pressing.Attaching the J2050A or JG2050 Antenna2050U.009JANUS 2.4 GHz Radio Frequency Quick Reference Guide7Attaching the JR2020G or JG2020 Antenna20X0Q.003Using the JANUS 2.4 GHz Installation UtilityBefore you can use your JANUS RF devices in a 2.4 GHz network, you mustconfigure the radio parameters and load the network software on them. Thereare two different installation utility kits:• The JANUS 2.4 GHz Installation Utility Kit for 1MB devices(Intermec P/N 064792)• The JANUS 2.4 GHz Installation Utility Kit for 4MB devices(Intermec P/N 064672You need to provide the network software (LAN WorkPlace for DOS orNetWare Client for DOS) that you install on your devices. The kit provides theinstallation utility that merges your network software with the JANUSsoftware, software for setting a security ID for your network, Intermec andNovell terminal emulation software that allow you to install terminalemulation, and boot utilities companion disks that ensure that you will berunning the latest JANUS firmware.The installation utility creates new drive images for your devices that allowsthem to connect with a Novell network or a TCP/IP-based UNIX networkusing RF communications. The installation utility runs on a host PC in the DOSenvironment and uses a DOS text-based interface to prompt you forinformation about your network.JANUS 2.4 GHz Radio Frequency Quick Reference Guide8Using the JANUS RF DevicesThis section contains information on the JANUS RF devices for the 2.4 GHznetwork.Note: If your device has sent or received TCP/IP packets when it was out of range of anaccess point, or if your device was placed in a suspend state, you may notice a delay inreconnecting to the network. The TCP/IP protocol determines the retransmissiontimeout based on the length of time the device is suspended or disconnected from thenetwork. For example, this delay can be 30 seconds if the device roams out of range for3 minutes. The maximum timeout can be from 30 seconds to 1 minute.Using the J2020 User’s Manual With Your JR2020G orJG2020Most of the information in the J2020 user’s manual also applies to yourJR2020G and JG2020. However, both of these readers do not have IRL loadedon them. Ignore the sections in your user’s manual that discuss IRL.Also, the JR2020G does not have a PC card slot. Ignore sections in your user’smanual that talk about using PC cards with your reader.Using the J2050 User’s Manual With Your J2050A orJG2050Most of the information in the J2050 user’s manual also applies to your J2050Aand JG2050. However, both of these devices do not have IRL loaded on them.Ignore the sections in your user’s manual that discuss IRL.Also, the J2050A for the 2.4 GHz RF network does not have a PC card slot.Ignore sections in your user’s manual that talk about using PC cards with yourdevice.Logging Into or Out Of Novell SoftwareIf you are a NetWare Client user or, if you are a LAN WorkPlace user usingSPX/IPX support, you must use special instructions when logging into aNetWare server from your JANUS device.To log into your network• Type IMLOGIN on your JANUS RF device.Note: Do not type LOGIN to log into your network.JANUS 2.4 GHz Radio Frequency Quick Reference Guide9To log out of your network• Type IMLOGOUT on your JANUS RF device.Note: You can also type LOGOUT.When you reboot your device, it automatically runs IMLOGIN. You willusually type IMLOGIN in these situations:• You roam out of range of an 0100 Access Point for an extended period oftime and the NetWare server logs out your device. When you return towithin range of an access point, you need to type IMLOGIN to log backinto the 2.4 GHz RF network.• You do not transmit any packets using your device for an extended periodof time. Your device may be placed in a suspend state and the NetWareserver logs out your device. When you press the  button, you must typeIMLOGIN to log back into the 2.4 GHz RF network.Using the JANUS Programmer’s Software Kit (PSK)The JANUS RF devices for the 2.4 GHz network cannot run Transmit orReceive functions provided by the JANUS PSK. TCP/IP and SPX/IPX protocolhandlers have not yet been developed. If you need these functions, useNovell’s off-the-shelf application programming interfaces (APIs) instead of theJANUS PSK.Developing ApplicationsIntermec recommends the following software if you need to developapplications that run on your JANUS RF devices in the 2.4 GHz network:• LAN WorkshopThis program is a high-level API for TLI development. You can developapplications for both TCP/IP and SPX/IPX.• NetWare Client SDKThis program allows you to develop applications for SPX/IPX.• Off-the-shelf APIs by Novell.Note: If you notice that your device is overheating or if it seems to be working better ina cold environment than a warm environment, your application may be sending toomany packets to the host. Reduce the number of packets sent to two or three packetsper second.JANUS 2.4 GHz Radio Frequency Quick Reference Guide10About the JANUS Configuration FilesWhen the JANUS RF device performs a cold boot, it looks for a configurationfile *.INI, whose path is specified in the AUTOEXEC.BAT file. The *.INI filethat you use depends on which software you install on your JANUS device.J24TE.INI If you install Intermec TNVTxxx, 3270, or 5250 terminal emulationsoftware, this configuration file is automatically loaded in the DRIVECsubdirectory.JANUS.INI If you install Novell TVNTxxx or NetWare Client, you need tocreate this configuration file. Use IC.EXE to create the JANUS.INI file and thenyou save it to drive E. If you do not want to lose the configuration file whenyou cold boot the device, you can put the JANUS.INI file in the DRIVECsubdirectory.Remember to update your AUTOEXEC.BAT file with the correct path name ofthe new JANUS.INI file.To load the JANUS.INI file1.Create a configuration file that you want to load whenever the readerperforms a cold boot.2.Save this configuration file as JANUS.INI.3.Copy the JANUS.INI to drive E on the device.Note: Since drive E is initialized on a cold boot, you will lose JANUS.INI if youperform a cold boot on the device. If you want to put the JANUS.INI file on driveC, use Auto-Loader or MkImage/PutImage to update drive C. Refer to yourJANUS user’s manual for more information.4.At the DOS prompt on the device, load the configuration file by typing:IC /L E:\JANUS.INIUsing RF CommunicationsOnce your RF system is configured for RF communications, you can begincollecting and transmitting data using your JANUS RF device. When youtransmit data using the JANUS RF device, the information is first sent to itsradio buffer. The data is then sent on to the access point and then to the host.If the RF network goes down, you can continue to collect data until the radiobuffer is full. When the buffer is full, the application returns a communicationtimeout status. The actual status response depends on what language you usedto develop the application.JANUS 2.4 GHz Radio Frequency Quick Reference Guide11When your RF network comes back up, the data in the radio buffer istransmitted to the host and you can once again transmit data.CautionDo not operate two RF devices within 2 feet (0.6 meters) of eachother when using RF communications. Doing so may damage theradio receivers.ConseilAssurez-vous de ne pas utiliser deux devices RF de carte à moinsde 2 pieds (0,6 mètres) l’un de l’autre lorsque vous effectuez descommunications en radiofréquence. Sinon, les récepteurs radiopourront être endommagés.Understanding the RF Status Icons and LEDsThe RF status icons on the JR2020G and JG2020 screens correspond to theConn/Data LEDs on the J2050A and JG2050 cases. These RF icons and LEDsare used to manage RF communications:*Connected This icon contains an asterisk. The icon or LED flashes when the RFinterface is either activelychannel searchingor tryingto reestablishcommunications with the network controller. When this icon or LED is solid,the RF interface is connected to a network controller. The RF interface in theJANUS RF device handles RF communications.If this icon or LED is off, RF communications are not possible. The JANUS RFdevice may not be set up correctly for RF communications or there may beanother problem such as the battery being low. If RF communications appearto be locked up, see one of the troubleshooting sections later in this guide formore help..Data This icon contains a square. The icon or LED turns on when data isbuffered in the RF interface. The data is either beingtransmitted to the networkcontroller or received data has not been accepted bythe JANUS RF deviceapplication. Up to five messages can be buffered in the RF interface.If there are messages in the RF interface when RF communications are turnedoff, the data icon or LED remains on.Note: Do not turn off the JANUS RF device when the data icon or LED is lit. If youturn off the device, the RF interface saves the data and attempts to transmit the dataagain when the device is powered on. If the device is not powered on for some time,there could be some confusion because the data could become meaningless and/ordisrupt the host application.JANUS 2.4 GHz Radio Frequency Quick Reference Guide12Battery (JR2020G or JG2020) This icon flashes when the NiCad batterypackcharge is low (approximately45 minutes left). Immediatelyreplace or rechargethe battery pack because you will soon lose RF communications.If you continue to operate the reader, the battery pack charge becomes verylow, the reader beeps, and RF communications are turned off. You cancontinue to collect data with the reader, but the data is not transmitted to thecontroller.If you continue to operate the reader, the battery pack becomes critically low.The battery icon turns on and stays on and the reader chirps every 15 seconds.After 1 minute, the reader turns off. You cannot turn it back on until youreplace the battery pack.Managing Your JR2020G and JG2020 Battery PowerThe JANUS reader’s RF interface has built-in power management to maximizethe life of the battery. The RF interface is the hardware and software built intothe reader to handle RF communications. For more ideas on how to conservebattery life, see your JANUS user’s manual.To conserve battery life, the RF interface turns off. You cannot use your readerto communicate in any of these situations:• The reader is off.• The RF protocol is disabled.• The RF protocol handler is not loaded.• The NiCad battery pack charge is very low.To avoid losing RF communications, replace or recharge the NiCad batterypack immediately when the battery icon on the reader display flashes.Approximately 15 minutes after the icon flashes, the reader beeps and RFcommunications are turned off.When you remove the battery pack, replace it immediately with a sparecharged battery pack. If you leave the reader without a charged battery packfor any length of time, you will prematurely discharge the lithium backupbattery.You can extend the life of the battery pack by setting the Duty Cycle Percentand Duty Cycle Period parameters on the reader. Duty cycle causes the RFinterface to alternate between receiving and standby. When the RF interface isin standby, it uses less battery power, but does not receive messages from thecontroller. The RF interface comes out of standby at the end of the duty cycleperiod, or when the reader sends a message through COM4.JANUS 2.4 GHz Radio Frequency Quick Reference Guide13Note: If the reader is not going to be used for 1 week or longer, it is important that youput the reader in Storage mode and remove the NiCad battery pack. If you do notremove the NiCad battery pack, the reader will slowly drain the battery pack. For help,see your JANUS user’s manual.Troubleshooting Your JR2020G and JG2020If you are having problems with RF communications, review the following listof problems and their possible solutions.Note: The 2020s and the 2050s have slightly different procedures. If you have aJ2050A or a JG2050, see to the next section, “Troubleshooting Your J2050A and theJG2050.”Problem SolutionThe RF option is not listed in theCom menu of IC.EXE.The device is not recognizing the RF interface. Contact yourIntermec service representative.You load the RF protocol handler and donot receive the message Intermec RFProtocol Handler.The RF interface is not responding. Contact your Intermecservice representative.The Battery icon is flashing at the top ofthe reader display.Replace or recharge the NiCad battery pack immediatelybecause you are about to lose RF communications.If the Battery icon is turning on and off and the readerbeeps, RF communications are turned off. You can continueto collect data with the reader, but the data is not beingtransmitted to the RF network.RF communications appear to be lockedup and the Connect icon turns off.There are three possible solutions:• Check the NiCad battery

pack. If the battery

packcharge is low, replace or recharge the battery

packimmediately.• Make sureyou are within range of a radio repeater orbase radio unit.• Press thebutton twice topartiallyreset the RFinterface. Perform a warm boot on the device (press the   keys in sequence) and contactyourIntermec service representative. Whenyou warm bootthe device,you will lose anydata stored in the RFinterface.JANUS 2.4 GHz Radio Frequency Quick Reference Guide14Troubleshooting Your J2050A and JG2050If you are having problems with RF communications, review the following listof problems and their possible solutions.Note: The 2020s and the 2050s have slightly different procedures. If you have aJR2020G or a JG2020, see to the previous section, “Troubleshooting Your JR2020Gand the JG2020.”Problem SolutionThe RF option is not listed in the Commenu of IC.EXE.The device is not recognizing the RF interface. Contact yourIntermec service representative.You load the RF protocol handler and donot receive the message Intermec RFProtocol Handler.The RF interface is not responding. Contact your Intermecservice representative.RF communications appear to be lockedup and the Connect LED turns off.There are three possible solutions:• Make sureyou are within range of a radio repeater orbase radio unit.• Press the  keys insequence) and contactyour Intermec servicerepresentative. Whenyou warm boot the device,youwill lose any data stored in the RF interface.• Press thebutton. Press -  - and thenpress. Press thebutton to turn the device back on. Atthe Boot Loader menu, select Storage mode. With thedevice in Storage mode, wait 60 seconds and thenpressagain. This sequence will cold start the radio, rebootthe device, and restart the application.